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Expected Positive Exposure. The Expected Positive Exposure (EPE) is the weighted average over time of the expected exposure, where the weights are the proportion that an individual expected exposure represents of the entire exposure horizon time interval [1]. The EPE can be calculated as.
Ppd is a one or two step test for past exposure to tuberculosis. Results are typically good for 1 year, however you only need them if someone requires you to have the test (school, work, etc.) a positive test does not indicate you have an active TB infection, just that you have been exposed to the organism in the past.